feat: Google Gemini ❇️ (#1355)

* refactor: add gemini-pro to google Models list; use defaultModels for central model listing

* refactor(SetKeyDialog): create useMultipleKeys hook to use for Azure, export `isJson` from utils, use EModelEndpoint

* refactor(useUserKey): change variable names to make keyName setting more clear

* refactor(FileUpload): allow passing container className string

* feat(GoogleClient): Gemini support

* refactor(GoogleClient): alternate stream speed for Gemini models

* feat(Gemini): styling/settings configuration for Gemini

* refactor(GoogleClient): substract max response tokens from max context tokens if context is above 32k (I/O max is combined between the two)

* refactor(tokens): correct google max token counts and subtract max response tokens when input/output count are combined towards max context count

* feat(google/initializeClient): handle both local and user_provided credentials and write tests

* fix(GoogleClient): catch if credentials are undefined, handle if serviceKey is string or object correctly, handle no examples passed, throw error if not a Generative Language model and no service account JSON key is provided, throw error if it is a Generative m
odel, but not google API key was provided

* refactor(loadAsyncEndpoints/google): activate Google endpoint if either the service key JSON file is provided in /api/data, or a GOOGLE_KEY is defined.

* docs: updated Google configuration

* fix(ci): Mock import of Service Account Key JSON file (auth.json)

* Update apis_and_tokens.md

* feat: increase max output tokens slider for gemini pro

* refactor(GoogleSettings): handle max and default maxOutputTokens on model change

* chore: add sensitive redact regex

* docs: add warning about data privacy

* Update apis_and_tokens.md

api/server/services/Endpoints/google/initializeClient.spec.js

@@ -0,0 +1,84 @@
+const initializeClient = require('./initializeClient');
+const { GoogleClient } = require('~/app');
+const { checkUserKeyExpiry, getUserKey } = require('../../UserService');
+
+jest.mock('../../UserService', () => ({
+  checkUserKeyExpiry: jest.fn().mockImplementation((expiresAt, errorMessage) => {
+    if (new Date(expiresAt) < new Date()) {
+      throw new Error(errorMessage);
+    }
+  }),
+  getUserKey: jest.fn().mockImplementation(() => ({})),
+}));
+
+describe('google/initializeClient', () => {
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+
+  test('should initialize GoogleClient with user-provided credentials', async () => {
+    process.env.GOOGLE_KEY = 'user_provided';
+    process.env.GOOGLE_REVERSE_PROXY = 'http://reverse.proxy';
+    process.env.PROXY = 'http://proxy';
+
+    const expiresAt = new Date(Date.now() + 60000).toISOString();
+
+    const req = {
+      body: { key: expiresAt },
+      user: { id: '123' },
+    };
+    const res = {};
+    const endpointOption = { modelOptions: { model: 'default-model' } };
+
+    const { client, credentials } = await initializeClient({ req, res, endpointOption });
+
+    expect(getUserKey).toHaveBeenCalledWith({ userId: '123', name: 'google' });
+    expect(client).toBeInstanceOf(GoogleClient);
+    expect(client.options.reverseProxyUrl).toBe('http://reverse.proxy');
+    expect(client.options.proxy).toBe('http://proxy');
+    expect(credentials).toEqual({});
+  });
+
+  test('should initialize GoogleClient with service key credentials', async () => {
+    process.env.GOOGLE_KEY = 'service_key';
+    process.env.GOOGLE_REVERSE_PROXY = 'http://reverse.proxy';
+    process.env.PROXY = 'http://proxy';
+
+    const req = {
+      body: { key: null },
+      user: { id: '123' },
+    };
+    const res = {};
+    const endpointOption = { modelOptions: { model: 'default-model' } };
+
+    const { client, credentials } = await initializeClient({ req, res, endpointOption });
+
+    expect(client).toBeInstanceOf(GoogleClient);
+    expect(client.options.reverseProxyUrl).toBe('http://reverse.proxy');
+    expect(client.options.proxy).toBe('http://proxy');
+    expect(credentials).toEqual({
+      GOOGLE_SERVICE_KEY: {},
+      GOOGLE_API_KEY: 'service_key',
+    });
+  });
+
+  test('should handle expired user-provided key', async () => {
+    process.env.GOOGLE_KEY = 'user_provided';
+
+    const expiresAt = new Date(Date.now() - 10000).toISOString(); // Expired
+    const req = {
+      body: { key: expiresAt },
+      user: { id: '123' },
+    };
+    const res = {};
+    const endpointOption = { modelOptions: { model: 'default-model' } };
+
+    checkUserKeyExpiry.mockImplementation((expiresAt, errorMessage) => {
+      throw new Error(errorMessage);
+    });
+
+    await expect(initializeClient({ req, res, endpointOption })).rejects.toThrow(
+      /Your Google Credentials have expired/,
+    );
+  });
+});